Generator regulator



A. F. BROTZ.

GENERATOR REGULATOR.

APPLICATION FILED APR.21,1921.

1,434,365. Patented Nov. 7, 1922.

%lta e Coil 16 1.5 12 Sex-i2? Field /17 E 3 Voltage Cbil B 18 6:52;; COL-l Miness es Attorney Patented Nov. 7, 1922.

UNITED STATES PATENT OFFICE.-

ANTON FRANK BROTZ, OF KOHLER,

WISCONSIN, ASSIGNOR TO KOHLER COMPANY, OF

KOHLER, WISCONSIN, A CORPORATION OF WISCONSIN.

GENERATOR REGULATOR.

Application filed April 21, 1921.

reference being had to the accompanying drawings, which are a part of this specifica-v tion.

This invention relates to generator regulators, and a particular object in View is to provide for widely varying the speed of the generator to correspond with great variations in the load while maintaining the volt- I age approximately constant.

ile the invention is not confined to any particular adaptation, it is especially applicable to internal combustion engine driven farm lighting and power plants and serves to approximately proportion the fuel consumption to the actual load.

Instead of regulating the voltage by maintaining constant speed, as usual with shunt or compound wound generators, a series field winding is used to buck or oppose the shunt field winding and thereby weaken the field strength as the load increases, while an automatic means tle of the engine to increase its speed. The two influences are so related that they maintain the voltage approximately constant.

With the above and other objects in view the invention consists in the generator reg ulator as herein claimed and all equivalents. D

Referring to the accompanying drawing in which like characters of reference indicate the same parts in different views:

Fig. 1 is a dia ram of a generator regulator embodying t is invention;

Fig. 2 is a similar view of a modification thereof; and

Fig. 3 is a detail view of the throttle actuating solenoid employed therein.

In these drawings 10 indicates a generator driven by an internal combustion engine whose throttle valve 11 is controlled by a solenoid having coils connected with the generator windings as will be described. The generator as shown is of the shunt type and supplies the mains 12 containing lamps 13 or other translating devices. The shunt field winding 14 of the generator is opposed by a bucking series field winding 15 which besimultaneously opens the throtposition against Serial No. 468,482.

comes stronger as the load on the mains increases and thereby opposes a greater influence to the shunt field to weaken the field strength. At the same time a series coil 16, also in the load circuit and of the engine to increase the speed of the engine.

s an example of a solenoid adapted for thisd purpose there is shown in Fig. 3 a solenoi shown in Fig. 1, or in parallel therewith as shown in Fig. 2, and the current or series coil 16 of few turns of large wire enclosed within an iron casing 19 having an iron head 20. The solenoid core 21 movable with in the brass core tube 22 is pivotally connected to the shorter arm of a bell crank lever 23 fulcrumed on a brass cap 24. The core is pressed upwardly by a coil spring 25 and is centrally positioned within the core tube and permitted to sway with the movements of the bell crank by having brass cross pins 26 through it slidably bearing on the core tube. I

A link 27 connects the longer arm of the bell crank lever 23 with the arm of throttle 11 so that in the extreme upper position of the core, as When the generator is not operating and the coils are therefore not energized, the throttle is held in apartly closed position a.

When the generator is started with a minimum load or no load condition on the service mains, the series coil 16 opposes the voltage coil 17 only slightly or not at all and the core will be drawn to its extreme lowermost the pressure of spring 25 and will move the throttle to a position 0 practically closing the intake manifold of the engine, sothat the engine operates at a minimum speed under which the generator develops the line voltage. As the load is increased and the generator field is weakened, as before mentioned, the influence of the bucking'current coil or series coil 16 be increase its speed corresponding with the increase in the load.

The full open position b of the throttle 11 is attained under the condition of maximum load and should for any reason the current strength be increased beyond this as upon the occurrence of an overload, the further movement of the throttle toward the a position resulting therefrom will tend to slow down the engine. Also, with automatic starting control, the partially closed position a of the throttle for starting prevents the engine from racing before connecting the enerator with the load, as is done when it 1s started with the throttle in full open position.

The proportioning of the field windings of the generator and of the coils of the solenoid and of the throttle and its operating means is made to compensate for a change in load by a change in speed without a material change in voltage developed by the generator. The weakening of the generator field by the bucking coil serves to facilitate the increasing of the speed of the engine caused at the same time by the bucking influence of the series coil of the solenoid, and this bucking field winding exaggerates the speed variation characteristic oi the generator for constant voltage conditions so that the desired object is accomplished of materially reducing fuel consumption to correspond with a reduction of load.

What ll claim as new and desire to secure by Letters Patent is;

1. A generator having an armature and a shunt field, service mains connected across the armature, a series field in series with the service mains and opposed to the shunt field, an engine having driving connection with the generator, and means dependent on the current flow through the service mains for moving the throttle of the engine from a partly closed position past the full open position to theclosed position.

tion past the open position to a partly closed position as the load on the service mains increases.

3. In a generating plant, an internal combustion engine driven generator having a shunt field, a series field comprising a bucking current coil in series with the service mains and opposing the shunt field to weaken the field as the load on the service mains increases, a solenoid having its core connected with the throttle of the internal combustion engine, a voltage coil on the solenoid tending to move the throttle to its closed position, and a current coil on the solenoid in series with the service mains opposing the voltage coil for moving the throttle toward and past its open position as the load on the service mains increases.

4. In a generating plant, a generator having a shunt field, a bucking series field opposed to the shunt field for reducing the field strength as the load increases on the service mains, a throttle for the internal combustion engine having means for urging it to a partly closed position, a solenoid connected with the throttle, a voltage coil of the solenoid tending to move the throttle from said position past the full open position to a closed position, and a bucking series coil of the solenoid in series with the service mains opposing the voltage coil to move the thrott e toward the full open position as the load on the service mains increases.

In testimony whereof, I aflix my signature.

ANTON FRANK BROTZ. 

